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Hi Dante,
Thanks for the update.
Please try running PowerShell commands to check if custom script is turned on on the site collection (please involve your company admin to do the following actions):
1. Install the SharePoint Online Management Shell by downloading and running the SharePoint Online Management Shell.
2. Start SharePoint Online Management Shell, enter
Connect-SPOService -Url https://$orgName-admin.sharepoint.com-Credential $userCredential
3. Enter Get-sposite -Identity<sitecollectionURL>| fl
4. Check the value for DenyAddAndCustomizePages. If it is enabled, then the Custom Script is turned off. Please use the commands below to enabled it: Set-SPOsite <SiteURL> -DenyAddAndCustomizePages 0 5. If it is turned off, please try disabling it (Set-SPOsite <SiteURL> -DenyAddAndCustomizePages 1) and then enabling it again to see the result.
If you can't edit page after trying the above, I checked the picture of your site page ribbon again, it seems different from mine. For further investigation, could you help confirm the following information:
1. Regarding the subsite is created from the parent template. If it means creating from parent site, how was the parent site created and do your company made customizations on the parent site?
2. Did you create the subsite by navigating to the Site Contents of the parent site>Click New button>Subsite>Select the parent site template? If so, please help share the parent site template with us for testing via private message (please help remove any private or sensitive information).
3. Please try creating a new subsite from the parent site template and another site template to see if you can edit the site home page.
4. Please let an another user (who has the same permissions on the parent site as you) tries to create a new subsite to see the outcome.
5. From the Site page's ribbon picture you provided previously, there is "Make Homepage" button, so the page you are trying to edit isn't the site home page? If so, please let us know how the page was created. Also help provide the site page's URL and the subsite's URL via private message for investigation as well.
Regards,
Joanne